use last parent snapshot

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1486611 13f79535-47bb-0310-9956-ffa450edef68
fix update of artifacts

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1486612 13f79535-47bb-0310-9956-ffa450edef68
snapshot repo not needed anymore

git-svn-id: https://svn.apache.org/repos/asf/archiva/sandbox/trunk@1486613 13f79535-47bb-0310-9956-ffa450edef68